Abstract: Azimuthal single-spin asymmetries SSA in semi-inclusive electroproductionof pi-mesons and charged K-mesons in deep-inelastic scattering of positrons andelectrons on a transversely polarised hydrogen target were observed.Significant SSA amplitudes for both the Collins and the Sivers mechanism arepresented for the full data set recorded with transverse target polarisation atthe HERMES experiment.